LOW COST ELECTRET HYDROPHONE

Award Information
Agency: Department of Defense
Branch: Defense Advanced Research Projects Agency
Contract: N/A
Agency Tracking Number: 10362
Amount: $49,833.00
Phase: Phase I
Program: SBIR
Awards Year: 1989
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
8801 Encino Ave, Northridge, CA, 91325
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Dr Mahendra Singh
 (818) 772-7898
Business Contact
Phone: () -
Research Institution
N/A
Abstract
RESEARCH TO DESIGN AND DEVELOP A LOW COST ELECTRET HYDROPHONE IS PROPOSED HERE. THE MAIN OBJECTIVE OF THE EFFORT IS TO DEVELOP MICRO-FABRICATION TECHNIQUES TO MAKE MINIATURE HYDROPHONES OF HIGH QUALITY. A SILICON WAFER IS CHEMICALLY ETCHED TO FORM A DIAPHRAGM. A METAL LAYER IS DEPOSITED TO FORM AN ELECTRET. ANOTHER METAL LAYER WAFER IS ALSO ETCHED TO FORM A DIAPHRAGM, BUT OF DIFFERENT THICKNESS. THE TWO WAFERS ARE BONDED TOGETHER TO YIELD A BATCH OF ELECTRET HYDROPHONES. SOUND WAVES PRODUCE DIFFERENT DEFORMATIONS IN THE TWO BACK-TO-BACK DIAPHRAGMS, HENCE, GENERATE A DIFFERENTIAL ELECTRICAL OUTPUT SIGNAL. A RESISTOR CONNECTED ACROSS THE METAL ELECTRODES YIELDS A SIGNAL WHEN THE SOUND WAVES IMPINGE ON THE LAYERED HYDROPHONE DIAPHRAGM.

* Information listed above is at the time of submission. *

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